1. Wear the right clothes Dress for the temperature. Layering clothes and wearing wool helps keep you warm in winter, and means you can turn your heater down. 2. Shut doors and close curtains Heating or cooling the whole house can be expensive. Where possible, shut doors to areas you are not using and only heat or cool the rooms you spend the most time in. Make sure your curtains or blinds seal your windows properly, and keep your curtains closed at night, and during the day